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Finding the Fourth Proportional to 98.67, 147.69 and 71.49

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Solution

The fourth proportional to 98.67, 147.69 and 71.49 is: 107.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.67 : 147.69 = 71.49 : x
  2. Step 2: Convert to fraction form
    98.67/147.69 = 71.49/x
  3. Step 3: Cross multiply
    98.67x = 147.69 × 71.49
  4. Step 4: Simplify right side
    98.67x = 10,558.36
  5. Step 5: Solve for x
    x = 10,558.36/98.67
  6. Step 6: Final answer
    x = 107.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.